To calculate the gravitational potential energy (GPE) at the top of the flight, we need to know the height the ball reaches. However, if we assume the ball is shot horizontally and neglect air resistance, the maximum height it reaches would be determined by its initial vertical velocity component. Since the ball is shot horizontally, the initial vertical velocity component is 0 m/s (assuming no vertical component is imparted at the moment of launch).
Therefore, at the top of the flight, the ball would have zero gravitational potential energy (GPE), as it would be at its highest point where the GPE is minimal.
